<!DOCTYPE html>

<html xmlns:th="http://www.thymeleaf.org">

<body>

<div th:fragment="side">
    <hr class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
    <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12 side">
        <a
           target="_blank">
            <img class="img-thumbnail" src="/images/yanyi.jpg">
        </a>
    </div>
    <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12 side">
侧边栏
    </div>
</div>
</body>
</html>